This is a discussion on SPT Exhaust to quiet! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; I know someone who changed the SPT for the SP Elite because the SPT was obnoxious. I have a Greddy ...

Made a big mistake in buying SPT. I love the exhaust when it comes to performance, but the sound is NOT what I was looking for. Typical mistake in buying something without knowing anything about it. Any help on getting that subaru rumble I love?

My SPT'd STi is incredibly loud compared to my old non-SPT WRX. Everyone comments on it, and it's even changed the way I drive because I don't want to draw undue attention to myself around town. A coworker has the SPT on his WRX (but no downpipe) and he says mine is way louder. People who ride in the backseat complain about it. It got even louder when I installed my Invidia catless DP. Now it's just downright obnoxious. At WOT it's louder than the thoughts in my head - I literally cannot hear myself think.

It definitely has that deep gurgley boxer rumble though. When it's warming up in the driveway it rattles every window in my house.

Yeah I'd go for a downpipe and tune. You'll get the sound back along with a very satisfying power bump.

Guys keep in mind that the exhausts sound different in the sedan & the hatch. It is nearly impossible to find an exhaust without at least some drone for the hatchbacks. Also it would be louder in the hatchback.

Guys keep in mind that the exhausts sound different in the sedan & the hatch. It is nearly impossible to find an exhaust without at least some drone for the hatchbacks. Also it would be louder in the hatchback.

Yeah I also switched from a sedan WRX no SPT to a hatch STi with SPT. It was quite a transition IRT noise levels. I can say that highway drone is minimal to none unless I get above 70mph, but with any amount of throttle it sets off car alarms and alerts every cop within half a mile. Got pulled over for "speeding" two weeks ago and let off with a warning cuz he didnt actually know how fast I was going, and pulled over again 20ft later by the same cop to get hassled about my exhaust.

You're going backwards. Exhausts usually dont get smaller in the middle, then get bigger at the end, unless its custom work. Even then, I don't see the point of restricting the flow, to making it flow better at the end. I think you mean the DP is 3inches at which goes to an SPT cbe that's 2.5inch. So all-in-all a persons exhaust would be 3in that tapers to 2.5. Does this make sense, However the SPT catback is in fact 2.5 inches for its entire piping....

You're going backwards. Exhausts usually dont get smaller in the middle, then get bigger at the end, unless its custom work. Even then, I don't see the point of restricting the flow, to making it flow better at the end. I think you mean the DP is 3inches at which goes to an SPT cbe that's 2.5inch. So all-in-all a persons exhaust would be 3in that tapers to 2.5. Does this make sense, However the SPT catback is in fact 2.5 inches for its entire piping....

No he's right. It tapers to 2.5 to mate to the stock downpipe, but the midpipe is 3inches. I just went outside and measured mine because you had me second-guessing myself. My SPT midpipe is the exact same diameter as my 3" Invidia downpipe, except at the midpipe/downpipe flange. The axleback is smaller, but not the midpipe.

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